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Optical Fibers under Irradiation

#2659


Effects Induced by Pulsed and Steady-State Irradiation of Silica Core Fiber Waveguides

Tech Area / Field

  • MAT-ELE/Organic and Electronics Materials/Materials
  • INF-ELE/Microelectronics and Optoelectronics/Information and Communications
  • PHY-OPL/Optics and Lasers/Physics

Status
3 Approved without Funding

Registration date
10.12.2002

Leading Institute
FEI (IPPE), Russia, Kaluga reg., Obninsk

Collaborators

  • SCK-CEN, Belgium, Mol\nTohoku University / Institute for Materials Research (IMR), Japan, Sendai\nNational Institute for Materials Science, Japan, Tsukuba\nEURATOM-Ciemat, Spain, Madrid\nTokyo Institute of Technology, Japan, Tokyo

Project summary

Purpose of the Project experimental study and finding out the mechanisms of radiation-induced changes of the properties of optical fibers; development of the methods of protection against irradiation effects and methods of processing the fibers for optical fiber systems of communication. It is assumed to perform experimental and theoretical studies on the following three basic problems:

– optical characteristics of the silica fibers under irradiation of various types.


– non-linear optics of fiber waveguides under irradiation;
– change of the properties of the optical fibers applied in communication systems by means of reactor, gamma and ion irradiation.

The purpose of the project comprises the following principal objectives:

1. Study on radiation-induced light emission and optical loss in the silica fibers under irradiation of various types:


– development of experimental techniques and calculations necessary to determine the efficiency of radiation-induced light emission and transient optical loss in the optical fibers under irradiation;
– measurements of radiation-induced light emission and transient optical loss of the silica fibers with various impurity content (ОН, F, etc.) during pulsed fission reactor irradiation, continuous 10 MeV proton irradiation and irradiation at Pu-Be and Co sources;
– experimental determination of the effect of the ionizing and damaging components of the irradiation on radiation-induced light emission and transient optical loss of the silica fibers.


2. Study on non-linear optical phenomena in the optical fibers under pulsed and steady-state irradiation.


– experimental study on the effect of the intensity of the probing light on the efficiency of radiation-induced light emission and transient optical loss of the optical fibers during intense pulsed reactor irradiation and continuous gamma irradiation;
– experimental study on the effect of irradiation on the numerical aperture of multi-mode optical fibers.


3. Change of the optical properties of the silica fibers by means of reactor, gamma and ion irradiation:


– study and characterization of the effect of various irradiation (reactor, gamma, ion irradiation) on the numerical aperture, material dispersion and inter-mode dispersion of the silica fibers with various impurity content (Ge, ОН, F, etc.);
– study on the effect of irradiation on the radial distribution of the refractive index in silica fibers;
– study and characterization of the effect of radiation-induced periodical variation of the refractive index along an optical fiber on the parameters of the silica optical fibers (dispersion, range of transmission, losses due to scattering and absorption).


4. Analysis of experimental and calculated data which will be obtained during the project. Release of the final report.

To attain the purpose of the project it will be used theoretical and experimental methods developed in SSC RF - IPPE in the field of radiation-resistant optics, experimental facilities and long experience of highly qualified specialists. SSC RF - IPPE is an only Russian institution where intensive radiation facilities together with an advanced theoretical and experimental base for materials testing are available. SSC RF – IPPE is a leading institution in Russia, where much experience in organizing and performing calculations and experiments on radiation-induced processes in materials has been attained. The scientific results on radiation material science obtained by the scientists from SSC RF - IPPE have been presented in many papers.

The project gives an opportunity for the scientists and engineers from SSC RF - IPPE who acquired experience and knowledge in the field of nuclear science, nuclear engineering and nuclear weapons to redirect their activity to peaceful purposes, namely, development of the methods of protection against irradiation and methods of processing the fibers for optical fiber systems of communication.

Accomplishment of the project in the framework of ISTC assumes tight collaboration and integration between Russian scientists and international scientific community, especially involved in ITER and/or DEMO projects.

Role of Foreign Collaborators.

The collaborators is: Tatsuo Shikama - Oarai Branch, Institute for Materials Research, Tohoku University, Japan.

The following activity of the collaborators is assumed in the framework of the project:

– exchange of information, relevant to radiation phenomena in dielectrics;


– discussions and refereeing the technical reports, submitted by project participants to the ISTC;
– participation in technical monitoring of project activities;
– joint seminars and work-shops;
– assistance and support for project participants to attend international meetings.

Expected results.

The expected results of the project are experimental and calculated data on radiation-induced phenomena in the silica fibers under irradiation of various types. Certain results are expected to be of practical use for determination of necessary function conditions for various fibers and development of the technological methods aimed to change the properties of the fibers applied in communication systems by means of reactor, gamma and ion irradiation.

Relevant references.

1. P.V.Demenkov, O.A.Plaksin, V.A.Stepanov, P.A.Stepanov, V.M.Chernov, K.M.Golant, A.L.Tomashuk. Optical Phenomena in KU-1 Silica Core Fiber Waveguides under Pulsed Reactor Irradiation. Journal of Nuclear Materials, 2001, v.297, pp.1-6.

2. P. V. Demenkov, O. A. Plaksin, V. A. Stepanov, P. A. Stepanov, V.M.Chernov. Transient Optical Phenomena in Quartz Fibers under High-Power Pulsed Reactor Irradiation. Technical Physics Letters, 2000, v. 26, N 3, p. 239-240.

3. A.L.Tomashuk, K.M.Golant, E.M.Dianov, O.I.Medvedkov, O.A.Plaksin, V.A.Stepanov, P.A.Stepanov, P.V.Demenkov, V.M.Chernov, S.N.Klyamkin. Radiation-Induced Absorption and Luminescence in Specially Hardened Large-Core Silica Optical Fibers. IEEE Transactions on Nuclear Science, 2000, vol. 47, No. 3, Part 1, pp. 693-698; Proceedings of 5th European Conference on Radiation and Its Effects on Components and Systems (RADECS’99), 13-17 Sept. 1999, Fontevraud, France, pp. 471-476.

4. P. V. Demenkov, O. A. Plaksin, V. A. Stepanov, P. A. Stepanov. Quenching of radiation-induced light emission of the silica core fiber waveguides due to probing light. Preprint IPPE – 2894, Obninsk, 2001.- 8 pages.


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